Final answer:
The leader of the largest political party in each house of Congress is known as the majority leader. The majority leader serves under the Speaker in the House and is the chief spokesperson in the Senate.
Step-by-step explanation:
The leader in each house of the largest political party is called the majority leader. In the House of Representatives, the majority leader serves under the Speaker of the House, who is elected by the entire body of representatives and is the only House officer mentioned in the Constitution. The Speaker is not only the presiding officer and administrative head of the House but also the partisan leader of the majority party. Meanwhile, in the Senate, due to the absence of a Speaker, the majority leader effectively serves as the functional leader and chief spokesperson for the majority party. Beneath the majority leader are the party whips, whose job includes enforcing party discipline and ensuring that members vote in line with the party's position on legislation.